dalen



G. DALE'N.

.MANUFACTURING LIGHTING BODIES.

APPLICATION FILED APR. 17, P918.

an STATES. EXTENT OFFICE.

GUSTAF DALEN, 0F s'rocKHoLM, SWEDEN, ASSIGNOR To AKTIEBOLAGET, KEROS, or sijDER'rALJE, SWEDEN.

MANUFACTURING LIGHTING-BODIES.

Specification of Letters Patent. Patented July 29, 1919.

Application filed April 17,1918. Serial No. 229,188.

To all whom it may concern:

Be it known that I, GUSTAF DALI IN, engineer, a subject of the King of Sweden, residing at Skiirsiitra, Lidingon, Stockholm, Sweden, have invented certain new and useful Improvements in Manufacturing Lighting-Bodies, of which the following is a specification.

The present invention refers to certain improvements in manufacturing lighting or illuminating bodies, such as are used 111 search light apparatus and the like. The invention consists in a method for fixing the lighting body, which preferably is manufactured in the form of an impregnated and baked cotton disk or pastil, or of a mass of compressed thorium and cerium oxid, if desired mixed with other substances, to a suitable backing by the aid of a fusing or conglomera-ting substance. Said substance should possess the property of: remaining non-fused or non-conglomerated at the temperature, to which the lighting body is exposed during it employment, but being fused or conglomerated at the higher temperature, prevailing during the manufacturing of the lighting body. The backing upon which the lighting body is secured by means of said substance may consist of a ceramic or fire proof material, such as china, clay, potstone or the like, or of a metal, such as iron, nickel or the like.

In the accompanying drawing:

Figure 1 represents a detail vertical section of an illuminating body and its backing and the attaching means constructed and arranged according to my invention; and

Fig. 2 represents a modification of the same.

In both figures 1 designates the illuminating pastil, which may be ofdisk-form, and 3 designates the attaching enamel or glazing. The backing or holder 2 (F 1) 1s provided with a recess, which recelves and holds these parts, leaving the pastil flush with said backing. The latter, as shown in said figure, is of fire-proof material, for example, ceramic, as stated. In Fig. 2 the backing or holder is a metal cup 2* fitting said pastil and enamel and provided for convenience with a stem 4, whereby it may be attached to a support.

In applying the astil, the layer of enamel 3 is applied to the bottom of the recess in the holder 2 or cup 2; the pastil is then fitted in said recess against said layer and the articleis heated to the fusing point of said enamel, which binds the pastil securely in position within said holder. The metal of, holder 2 is suificiently refractory for resisting injury by the increase of temperature.

According to one mode of executing the invention the lightingbody is prepared in a known manner, as by impregnating cotton and forming'a round disk or pastil thereof, which then is baked. On a backing in the form of a disk of fire proof or ceramic material or on a metal disk, preferably excavated so as to suit said pastil, an enamel or glazing is placed, whereafter the lighting body is applied to said disk and is heated preferabl in a suitable furnace together with the dis to the fusing point of said enamel or glazing. In this manner the lighting body is firmly secured to the backing, provided the enamel is such that it does not fuse at the temperature, to which the lighting body is exposed during its employment.

The glazing or enamel above referred to may consist of various compositions, such as cilicic acid, quartz, silicates, borax, phosphates and oxids or basic compositions such as lime, litharge, soda, potash and magnesia. As an example of a suitable composition may be mentioned: 100 parts pulverized quartz, 19 parts borax, 88 parts puttypowders, 44 parts calcined soda, 29 parts nitrate of potash, and H parts burnt magnesia.

The backing may be formed or arranged in such a manner as to constitute itself the necessary holder or carrier of the lighting body or it may be formed so as to be fixed to or inserted in a separate holder for the lighting body.

Having now described my invention and set forth in which manner the same is to be performed, what I claim is:

1. A method of manufacturing lighting bodies, consisting in impregnating cotton, forming a lighting body thereof, baking the same, applying said body to a backing provided with a conglomerating substance, and heating the lighting body together with the backing to the fusing point of said conglomerating substance.

2. A method of manufacturing lighting bodies, consisting in impregnating cotton, giving the same the form of a pastil, baking said pastil, applying the pastil to an excavated backing, provided with an enamel or glazing, and heating the pastil together with the backing to the fusing point of said enamel or glazing.

3. A method of manufacturing lighting bodies, consisting in impregnating cotton, forming a disk or pastil thereof, baking said pastil, applying the pastil to a backing, providedwvith an enamel or glazing, having a fusing point above the temperature, to which the lighting body is exposed, when in use, and heating the pastil together with the backing to the fusing point of said enamel or glazing.

4. In combination with a backing of refractory material having a recess formed therein, an. illuminating body set into said recess and fused attaching material also set into said recess and holding the pastil in place.

5. A pastil of illuminating material, in

combination with a backing recessed to receive the same and'a layer of fusible attaching material arranged in the recess of said backing between it and said pastil.

6. A holder in the form of a cup or recessed disk having a stem for attachment to a standard, in combination with a disk of illuminating material set into the recess of said holder flush with the face of the latter and a layer of enamel in said recess for attaching said illuminating material to said backin In testimony whereof I have signed'my name to this specification in the presence of two subscribing witnesses.

GUSTAF DALE-TN.

Witnesses:

VVALDEMAR BOMAN, A, Bionck.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, I). C, 

